[lubuntu] Username does not show in login-screen (Lubuntu LXDE)

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http://ubuntuforums.org – Hello readers, I use NFS to connect to an NFS share on my iMac from my Lubuntu netbook. Initially I could not connect to the NFS share on my iMac. I found the answer in changing my UID in Lubuntu from 1000 to 501 (so now these are equal on both my iMac and my Lubuntu netbook for the same user). But when I log-in to Lubuntu LXDE my username does not show up anymore in the list of users. Does anyone know how I can put it back there? It is not a big issue, but it would be nice if I could put it back. Thank's in advance, Marco (Hardware)